.full {
    height: 100%;
    width: 100%;
    padding: 0;
    margin: 0;
}

.flex-center {
    display: flex;
    justify-content: center;
    align-items: center;
}

html,
body {
    .full();
    background-color: #fff;
}

#app {
    .full();
    .flex-center();

    .box {
        width: 200px;
        height: 200px;
        border-radius: 100%;
        background-color: rgba(255, 0, 255, .2);
        transform: rotate(45deg);
        animation: appScanle 1s ease-in-out infinite;
        position: relative;

        &::after {
            content: '';
            display: block;
            position: absolute;
            top: 50px;
            bottom: 50px;
            left: 50px;
            right: 50px;
            border-radius: 100%;
            animation: appScanle 1s 0.5s ease-in-out infinite;
            background-color: rgba(255, 255, 0, .3);
        }
    }
}

@keyframes appScanle {
    0% {
        transform: scale(0);
    }

    50% {
        transform: scale(2);
    }

    100% {
        transform: scale(0);
    }
}